Abstract: Here the genesis of gas pools of carbon dioxide in east China are analysed and discussed. Based on the principles of plate tectonics and the forming mechanism of rift basin, it is considered that the formation of high purity-carbon dioxide was closely related to volcanic activities, probably, it came from deep crust down to the mantle. In the process of the formation and evolution of hydrocarbon-bearing rift basin, frequent volcanic eruptions had provided gas sources for gas pools of carbon dioxides. Besides, rift basin processed the conditions of reservoir and preservation for the formation of oil and gas (including carbon dioxide) pools.